Typically these kids will normally have their head stuck so far up the director's butt that they can see the light on the other side. Theatre Whores usually have God like mentality of themselves, and think they're obviously superior to normal/non-talented people, and spend the majority of the time comparing themselves to other Theatre kids around them (usually thinking their the best).

Katie: He's really struggling on that high note sounds terrible!
Ruby: Urgh I know we could do SO much better dont you think?
Katie: Lets do it in his face!
Ruby: OMG yes were such theatre whores!